The Natural History Museum has been warned that a forthcoming trip to find
hundreds of new species in the remote forests of Paraguay could risk the
lives of indigenous people and the scientists.

The 100-strong expedition, one of the largest undertaken by the museum in the last 50 years, is due to set off in the next few days to explore one of the most unknown regions of the world for one month.

However the museum has been warned by campaigners that the trip could cause “genocide” for isolated tribes.

The group Iniciativa Amotocodie, that protects local indigenous people, said groups of Ayoreo Indians in the area have never come into contact with westerners before. If they come across the expedition without preparation they could catch common western viruses that could wipe out the small groups in a matter of weeks.

A statement from the group, that has been circulated online, read: “If this expedition goes ahead we will not be able to understand why you prefer to lose human lives just because the English scientists want to study plants and animals. There is too much risk: the people die in the forest frequently from catching white people’s diseases – they get infected by being close. Because the white people leave their rubbish, their clothes, or other contaminated things. It’s very serious. It’s like genocide.”

Jonathan Mazower, Director of Advocacy at Survival International, said there was also a risk to the scientists as tribes have been known to throw spears at groups they fear have come to cause them harm. Westerners going into the area have been killed before.

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He said it was impossible to know where the tribal groups are therefore it is better to “err on the side of caution given that the consequences for either side could be pretty disastrous.”

“The danger is to the scientists and to the indigenous people. The scientists because the indigenous people may view them as hostile and attack them and the indigenous people because the scientists carry common western viruses that they have no immunity to,” he said.

The vast area of dry forest across parts of Bolivia, Argentina as well as Paraguay, known as the Gran Chaco, is the only place in South America outside the Amazon where there are uncontacted tribes. Until about 1950 it was thought there were around 5,000 people in the area but now there are thought to be less than 150 as people leave or die out.

Richard Lane, Director of Science at the NHM, confirmed that he had received a letter from a group representing indigenous groups.

But he insisted the expedition has taken every precaution to ensure they do not come into contact with isolated tribes. He said a member of the Ayoreo community will go ahead of the rest of the rest of the group to make sure that there is no opportunity of contact with isolated tribes, as well as helping the scientists through local knowledge.

“Clearly the needs of indigenous people to remain uncontacted needs to be respected and we as an institution have always respected that,” he said.